12972166 has 4 divisors (see below), whose sum is σ = 19458252. Its totient is φ = 6486082.

The previous prime is 12972149. The next prime is 12972217. The reversal of 12972166 is 66127921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66127921 = 23 ⋅2875127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3243040 + ... + 3243043.

It is an arithmetic number, because the mean of its divisors is an integer number (4864563).

Almost surely, 2^12972166 is an apocalyptic number.

12972166 is a deficient number, since it is larger than the sum of its proper divisors (6486086).

12972166 is an equidigital number, since it uses as much as digits as its factorization.

12972166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6486085.

The product of its digits is 9072, while the sum is 34.

The square root of 12972166 is about 3601.6893258581. The cubic root of 12972166 is about 234.9655359147.

The spelling of 12972166 in words is "twelve million, nine hundred seventy-two thousand, one hundred sixty-six".